What Is Chlorine Gas?
ATSDR describes chlorine as a gas with a very irritating odor that is used in the production of thousands of products and for water disinfection, though the chlorine itself is quickly transformed into other chemicals at the beginning of that process.
Most exposures are accidents. ATSDR says exposure can follow a leak or spill from a chlorine tank or the improper use of swimming pool chemicals, and can happen if you mix household chemicals such as toilet cleaner with bleach. It says low levels of chlorine gas can irritate the nose, throat and eyes. The CDC explains that when chlorine gas touches moist tissue like the eyes, throat and lungs it creates an acid that can hurt those tissues, and that breathing problems may show up right away if high amounts are breathed in.
If chlorine is released outdoors, the CDC says to go indoors and shelter in place with windows closed and ventilation systems turned off, or to leave the area if you cannot get inside. To get clean, it says to take off all clothes, jewelry and accessories and shower as soon as you can, calling showering the best method for removing chlorine from your body.
Sources checked September 15, 2026. Every point below links the page it came from.
The sources behind this answer
- Government sourceATSDR describes chlorine as a gas with a very irritating odor, used in the production of thousands of products and for water disinfection, where it is quickly transformed into other chemicals. ATSDR, CDC ↗
- Government sourceATSDR says chlorine exposure can follow a leak or spill from a chlorine tank or improper use of swimming pool chemicals, and low levels of chlorine gas can cause nose, throat and eye irritation. ATSDR, CDC ↗
- Government sourceATSDR says you may be exposed to chlorine if you mix household chemicals such as toilet cleaner with bleach. ATSDR, CDC ↗
- Government sourceThe CDC says chlorine gas creates an acid when it touches moist tissues like the eyes, throat and lungs, and breathing problems may show up right away if high amounts are breathed in. CDC ↗
- Government sourceThe CDC says that after an outdoor chlorine release you should go indoors and shelter in place with windows closed and ventilation off, or leave the area if you cannot go indoors. CDC ↗
- Government sourceThe CDC says to remove all clothes, jewelry and accessories and shower as soon as you can after chlorine exposure, calling showering the best method for removing chlorine from your body. CDC ↗
Sources checked September 15, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.